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Date: Mon, 24 Jan 2022 15:11:01 +0800 From: Lu Baolu <baolu.lu@...ux.intel.com> To: Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>, Christoph Hellwig <hch@...radead.org>, Ben Skeggs <bskeggs@...hat.com>, Kevin Tian <kevin.tian@...el.com>, Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com> Cc: Alex Williamson <alex.williamson@...hat.com>, Eric Auger <eric.auger@...hat.com>, Liu Yi L <yi.l.liu@...el.com>, Jacob jun Pan <jacob.jun.pan@...el.com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Thierry Reding <thierry.reding@...il.com>, Jonathan Hunter <jonathanh@...dia.com>, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com> Subject: [PATCH 6/7] iommu: Use right way to retrieve iommu_ops The common iommu_ops is hooked to both device and domain. When a helper has both device and domain pointer, the way to get the iommu_ops looks messy in iommu core. This sorts out the way to get iommu_ops. The device related helpers go through device pointer, while the domain related ones go through domain pointer. Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com> --- include/linux/iommu.h | 8 ++++++++ drivers/iommu/iommu.c | 25 ++++++++++++++----------- 2 files changed, 22 insertions(+), 11 deletions(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index aa5486243892..111b3e9c79bb 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -385,6 +385,14 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather) }; } +static inline const struct iommu_ops *dev_iommu_ops_get(struct device *dev) +{ + if (dev && dev->iommu && dev->iommu->iommu_dev) + return dev->iommu->iommu_dev->ops; + + return NULL; +} + #define IOMMU_BUS_NOTIFY_PRIORITY 0 #define IOMMU_GROUP_NOTIFY_ADD_DEVICE 1 /* Device added */ #define IOMMU_GROUP_NOTIFY_DEL_DEVICE 2 /* Pre Device removed */ diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 5230c6d90ece..6631e2ea44df 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -764,6 +764,7 @@ EXPORT_SYMBOL_GPL(iommu_group_set_name); static int iommu_create_device_direct_mappings(struct iommu_group *group, struct device *dev) { + const struct iommu_ops *ops = dev_iommu_ops_get(dev); struct iommu_domain *domain = group->default_domain; struct iommu_resv_region *entry; struct list_head mappings; @@ -785,8 +786,8 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group, dma_addr_t start, end, addr; size_t map_size = 0; - if (domain->ops->apply_resv_region) - domain->ops->apply_resv_region(dev, domain, entry); + if (ops->apply_resv_region) + ops->apply_resv_region(dev, domain, entry); start = ALIGN(entry->start, pg_size); end = ALIGN(entry->start + entry->length, pg_size); @@ -831,8 +832,10 @@ static int iommu_create_device_direct_mappings(struct iommu_group *group, static bool iommu_is_attach_deferred(struct iommu_domain *domain, struct device *dev) { - if (domain->ops->is_attach_deferred) - return domain->ops->is_attach_deferred(domain, dev); + const struct iommu_ops *ops = dev_iommu_ops_get(dev); + + if (ops->is_attach_deferred) + return ops->is_attach_deferred(domain, dev); return false; } @@ -1251,10 +1254,10 @@ int iommu_page_response(struct device *dev, struct iommu_fault_event *evt; struct iommu_fault_page_request *prm; struct dev_iommu *param = dev->iommu; + const struct iommu_ops *ops = dev_iommu_ops_get(dev); bool has_pasid = msg->flags & IOMMU_PAGE_RESP_PASID_VALID; - struct iommu_domain *domain = iommu_get_domain_for_dev(dev); - if (!domain || !domain->ops->page_response) + if (!ops || !ops->page_response) return -ENODEV; if (!param || !param->fault_param) @@ -1295,7 +1298,7 @@ int iommu_page_response(struct device *dev, msg->pasid = 0; } - ret = domain->ops->page_response(dev, evt, msg); + ret = ops->page_response(dev, evt, msg); list_del(&evt->list); kfree(evt); break; @@ -1758,10 +1761,10 @@ static int __iommu_group_dma_attach(struct iommu_group *group) static int iommu_group_do_probe_finalize(struct device *dev, void *data) { - struct iommu_domain *domain = data; + const struct iommu_ops *ops = dev_iommu_ops_get(dev); - if (domain->ops->probe_finalize) - domain->ops->probe_finalize(dev); + if (ops->probe_finalize) + ops->probe_finalize(dev); return 0; } @@ -2020,7 +2023,7 @@ EXPORT_SYMBOL_GPL(iommu_attach_device); int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain) { - const struct iommu_ops *ops = domain->ops; + const struct iommu_ops *ops = dev_iommu_ops_get(dev); if (ops->is_attach_deferred && ops->is_attach_deferred(domain, dev)) return __iommu_attach_device(domain, dev); -- 2.25.1
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